CheckedChanged Event
using System;
using System.Drawing;
using System.Windows.Forms;
class RadioButtons: Form
{
bool bFillEllipse;
Color colorEllipse;
static void Main()
{
Application.Run(new RadioButtons());
}
RadioButtons()
{
ResizeRedraw = true;
string[] astrColor = { "Black", "Blue", "Green", "Cyan"};
GroupBox grpbox = new GroupBox();
grpbox.Parent = this;
grpbox.Text = "Color";
grpbox.Location = new Point(Font.Height / 2, Font.Height / 2);
grpbox.Size = new Size(9 * Font.Height, (3 * astrColor.Length + 4) * Font.Height / 2);
for (int i = 0; i < astrColor.Length; i++)
{
RadioButton radiobtn = new RadioButton();
radiobtn.Parent = grpbox;
radiobtn.Text = astrColor[i];
radiobtn.Location = new Point(Font.Height,3 * (i + 1) * Font.Height / 2);
radiobtn.Size = new Size(7 * Font.Height,3 * Font.Height / 2);
radiobtn.CheckedChanged += new EventHandler(RadioButtonOnCheckedChanged);
radiobtn.Checked = true;
}
CheckBox chkbox = new CheckBox();
chkbox.Parent = this;
chkbox.Text = "Fill Ellipse";
chkbox.Location = new Point(Font.Height, 3 * (astrColor.Length + 2) * Font.Height / 2);
chkbox.Size = new Size(Font.Height * 7, 3 * Font.Height / 2);
chkbox.CheckedChanged += new EventHandler(CheckBoxOnCheckedChanged);
}
void RadioButtonOnCheckedChanged(object obj, EventArgs ea)
{
RadioButton radiobtn = (RadioButton) obj;
if(radiobtn.Checked)
{
colorEllipse = Color.FromName(radiobtn.Text);
Invalidate(false);
}
}
void CheckBoxOnCheckedChanged(object obj, EventArgs ea)
{
bFillEllipse = ((CheckBox)obj).Checked;
Invalidate(false);
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics grfx = pea.Graphics;
Rectangle rect = new Rectangle(10 * Font.Height, 0,
ClientSize.Width -
10 * Font.Height - 1,
ClientSize.Height - 1);
if(bFillEllipse)
grfx.FillEllipse(new SolidBrush(colorEllipse), rect);
else
grfx.DrawEllipse(new Pen(colorEllipse), rect);
}
}
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